然而，在哺乳动物物种之间，端粒酶的调控和端粒长度存在显著差异。在人类中，端粒酶的表达局限于少数器官，如睾丸、卵巢和胸腺，许多老化组织中的端粒会逐渐耗尽。但对 60 多种哺乳动物的比较研究发现，包括小鼠在内的许多生物并没有端粒介导的复制性衰老现象。小鼠的端粒酶表达限制较少，大多数组织都能表达较高水平的 Tert mRNA 和端粒酶活性。实验室内的近交系小鼠，如 ...

Robust global output surpassing ten million metric tons annually anchors efficient capacity utilization. Aggressive regional pricing and innovative production investments boost dynamic growth in ...

The results of most clinical trials with the thistle (Silybum marianum) extract, silymarin, are difficult to interpret because of a variety of reasons: small sample size, variability in type and ...

Chromosomes are cellular structures that contain the genetic material. A chromosome is comprised of a single DNA molecule that may be either circular or linear. The full complement of a cell s ...